e805398

[JSC][Temporal] Fix crash in Temporal.PlainMonthDay.from with very large string input
https://bugs.webkit.org/show_bug.cgi?id=316805
rdar://179110736

Reviewed by NOBODY (OOPS!).

fromMonthDayString used makeString to include the user-supplied string
in the RangeError message. makeString calls WTFCrash on allocation
failure, so passing a very large string (e.g. ~2 GB) caused a crash
instead of a clean RangeError.

Fix by using tryMakeString with a static fallback message, matching the
pattern already used in fromYearMonthString.

Test: JSTests/stress/temporal-plainmonthday-from-large-string.js

e805398

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